|
STATUS OF STUDIES TAKEN UP BY
CENTRAL GROUND WATER, SECR, CHENNAI
1) STATUS OF HYDROGEOLOGICAL SURVEYS (AS ON 31.03.05)
|
Area Covered By Systematic Hydrogeological Survey (Sq.Km) |
1,30,060
(100%) |
|
Area Covered
By Systematic Surveys In Hard Rock Area (Sq.Km) |
99,224
(100%) |
|
Area Covered By District Ground Water Management Studies (Reappraisal) (Sq.Km) |
1,73,256 |
2)
STATUS OF GROUND WATER EXPLORATION (AS ON 31.03.05)
a)
No.Of Borewells Drilled In Hard Rocks As On 31.3.2005
| Exploratory
Wells |
566+110* |
| Observation
Wells |
218 |
| Slimholes |
5 |
| Piezometers |
7 |
| Piezometers
(Hydrology Project) |
395 |
| Total |
1301 |
| Maximum
Depth Drilled (m) |
300 |
*Constructed through out-sourcing for drought
mitigation
b)
No Of Boreholes Drilled
In Sedimentary Rocks As On 31.3.2005
| Exploratory
Wells |
233 |
| Observation
Wells |
81 |
| Slimholes |
2 |
| Piezometers |
19 |
| Piezometers
(Hydrology Project) |
37 |
| Total |
372 |
| Maximum
Depth Drilled (m) |
777 |
| No.
Of Deposit Wells Constructed |
91 |
c)
Status Of Handing Over
Of Exploratory Wells (As On 31.03.05)
| No
of wells handed over to state agencies- |
1168 |
| No
of wells yet to be offered- |
14 |
3)
Estimation of ground water resources as per
gec (1997)
norms (as in January, 2003)
| Total
dynamic ground water resource (mcm) |
23070 |
| Net
annual ground water availability (MCM) |
20763 |
| Gross
ground water draft for irrigation (MCM) |
16742 |
| Gross
groundwater draft for domestic & industrial demand (MCM) |
878 |
| Allocation
for domestic and industrial demand up to next 25 years (MCM) |
878 |
| Net
ground water availability for irrigation (MCM) |
3142 |
4)
CATEGORISATION OF BLOCKS (AS ON JANUARY 2003)
| No.of
over exploited blocks |
138 |
| No.of
critical blocks |
37 |
| No.of
semicritical blocks |
105 |
| No
of safe blocks |
97 |
| No
of saline blocks |
8 |
5)
ASSISTANCE TO STATE GOVERNMENT DEPARTMENT
| No
of habitations cleared for supply of fluoride free drinking water under
Rajiv Gandhi national drinking water mission |
567 |
| Financial
assistance rendered under central sector schemes for artificial recharge
to ground water (13 schemes) during 8th & 9th
five-year plans |
Rs.176.80
lakh |
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